condition mean min max ZT0-3 29.78645 27.8467 31.7262 ZT4-7 29.9906 29.9906 29.9906 ZT8-11 54.462199999999996 54.462199999999996 54.462199999999996 ZT12-15 0 0 0 ZT16-19 60.30955 60.30955 60.30955 ZT20-23 51.71515 51.71515 51.71515